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Powertap track hub is my favoured option for track and for fixed gear bikes. I have six of them. The only downside is that if you try to back-pedal too hard, or skid, the internals start unwinding themselves, which is bad. If you can avoid that, they're brilliant. But the 'no back-pedalling/resisting forward motion too hard' thing might make them unviable for fixed crits. In which case, you're back to a spider or crank arm based option.
@laner Let's chat when you're back..
Thanks everyone else. Garmin vectors are out due to pedal strike risk in fixed crits.
Powerpod on handlebars probably isn't allowed on track.
Powertap hub is probably the best option.